Collapsible core for pipe-molding apparatus.



No. 838,934. PATENTED DEC. 18, 1906. N. BALDWIN.

COLLAPSIBLE GORE PO R PIPE MOLDING APPARATUS.

APPLICATION FILED 0GT.11, 190s.

THE Mann's PETERS co., WASHINGTON. n. c.

NEWVTON BALDWIN, OF OOLDWATER, MICHIGAN.

COLLAPSIBLE CORE FOR PIPE-MOLDING APPARATUS.

Specification of Letters Patent.

Patented Dec. 18, 1906.

Application filed October 11,1906. Serial No. 338,431.

To aZZ whom, it may concern:

Be it known that I, NEWTON BALDWIN, a citizen of the United States, residing at Coldwater, in the county of Branch and State of Michigan, have invented certain new and useful Improvements in Collapsible Cores for Pipe-Molding Apparatus, of. which the following is a specification.

My invention relates to apparatus for molding pipes or cylindrical tiles of plastic material. The core used in such apparatus usually consists of a sheet-metal tube that is arranged to collapse to permit withdrawal from the pipe or tile when molded.

My invention has for its object the improvement of the core by which the two edges of the core are secured to a cranked shaft, so that when the shaft is rocked in one direction the core is expanded and may be held in the expanded position by means of a suitable hook, while when the shaft is rocked in an opposite direction the core is collapsed and in the operation of collapsing the core is separated from the molded article by lifting it therefrom instead of drawing it along the surface of the article.

The construction and operation of my im-.

proved collapsible core will be described in detail hereinafter and illustrated in the accompanying drawings, in which Figure 1 is a longitudinal sectional view of a core involving my improvements; Fig. 2, a cross-sectional view showing the core eX- panded, and Fig. 3 a similar view showing the core collapsed.

In the drawings similar reference characters indicate corresponding parts in all the views.

The core A is made of sheet metal bent to a cylindrical shape and having its meeting edges overlapping, as shown. B indicates a rod or shaft journaled at C adjacent to the edge of the outer of the meeting edges of the core and having cranks D therein secured to loops E on the inner edge of the core. The

ends of rod or shaft B are bent to form or have operating-levers F secured thereto.

G indicates a latch or hook pivotally secured to the casing A and adapted to turn and engage one of the loops E when the core is expanded.

In collapsing the core from the position shown in Fig. 2 to that shown in Fig. 3 it will be apparent that as the inner edge of the core is drawn inwardly by turning or rocking shaft or rod B the surface of the core is pulled away from the inner surface of the molded article, the part of the core nearest the inner edge traversing the greatest distance and the distance decreasing to the outer edge, but the entire surface of the core to the journals 0 is drawn away from the article to a more or less degree, and the core is easily removed from the mold.

Having thus described my invention, what I claim is 1'. A collapsible core for pipe-molding apparatus consisting of a sheet of metal bent to cylindrical form with overlapping edges, a rock-shaft journaled adjacent to the outer of said overlapping edges said shaft having cranks, and means to journal the inner edge of said overlapping edges directly to said cranks, so that when said shaft is rocked said inner edge is lifted away from the outer of the overlapping edges and passes through an arc of which said cranks are the radii, substantially as shown and described.

2. A collapsible core for pipe-molding apparatus comprising a sheet of metal bent to cylindrical form with overlapping edges, a rock-shaft journaled adjacent to the outer of said overlapping edges and on the inner surface of the core, said shaft having cranks, loops rigidly secured to the inner of said overlapping edges and to said cranks, so that when said shaft is rocked said inner edge is lifted away from the outer of the overlapping edges and passes through an arc of which said cranks are the radii, operating-levers at the ends of the shaft, and a catch pivotally secured adjacent to said shaft and adapted to engage one of said loops when the coil is expanded, substantially as shown and described.

In testimony whereof I hereto afiiX my signature in the presence of two witnesses.

NEWTON BALDWIN.

Witnesses:

E. E. PALMER, AeNEs GIBSON. 

